Home / 2,155.25-2,974.65-1,223.75

Finding the Fourth Proportional to 2,155.25, 2,974.65 and 1,223.75

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Solution

The fourth proportional to 2,155.25, 2,974.65 and 1,223.75 is: 1,689.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.25 : 2,974.65 = 1,223.75 : x
  2. Step 2: Convert to fraction form
    2,155.25/2,974.65 = 1,223.75/x
  3. Step 3: Cross multiply
    2,155.25x = 2,974.65 × 1,223.75
  4. Step 4: Simplify right side
    2,155.25x = 3,640,227.94
  5. Step 5: Solve for x
    x = 3,640,227.94/2,155.25
  6. Step 6: Final answer
    x = 1,689.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.